#include <stdio.h>  
int main(int argc, char *argv[]){  
    
   char *p3 = "a";
   char *p4 = "b";
   char *p1 = p3;
   char *p2 = p4;
   char *data[10];
    // data[0] =NULL;
    //   data[9] ='\0';
    // for (size_t i = 0; i < 10; i++)
    // {
    //     printf("%#s ",data[i]);
    // }
    
   while(*p1 != '\0' && *p2 != '\0' && *p1 == *p2){p1++;p2++;};
   printf("%d",(unsigned)*p1 -(unsigned)*p2);
   char w = '1';int x = 1;float y = 1,z = 1;
   printf("%ld\n",sizeof(w *x + z -y));

    return 0;  
}
